Question

13. If f:R R is defined as f(x) = 2x ^ 2 - 1 , find the pre-images of 17, 4 and -2.​

Answer 1

Step-by-step explanation:

f(x)=2x²-1

let x= -2 ,

f(-2)=2(-2)²-1 =2(4)-1 =8-1 = 7

let x=4,

f(4)=2(4)²-1 =2(16)-1 =32-1 =31

let x=17,

f(17)=2(17)²-1 =2(289)-1 =578-1 =577